/Engine/Source/Editor/UnrealEd/Classes/Factories/FbxSceneImportFactory.h
Make sure GlobalImportSettings is pointing to the correct options
void ApplyMeshInfoFbxOptions ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FFbxMeshInfo](API\Editor\UnrealEd\Factories\FFbxMeshInfo) > MeshInfo )